Nesoi was placed into the care of Teddy and Calypso by the latter's cousin, a member of the ice flight. According to him, they discovered her as a hatchling, sitting alone on one of the Frigid Floes. They quickly discovered that she was very attuned to nature, and spent most of her time outside the lair, even in the worst of weather. For this reason, she found companionship in her adopted sister, Circe, and often partakes in her foraging expeditions with great intrest, since plants were a rarity where she grew up.
Despite being initially rather skittish of her new environment, Nesoi quickly learned how to adapt her hunting techniques to fit the enclosed spaces of the Sunbeam Ruins. She always felt a sense of kinship with Polyphemus, who like herself was an outsider. This deepened when he suprisingly chose her to be his mate, rather than Demeter, with whom he'd been friends since childhood.